The Blueprint Controllers® CO2 Regulator BCR-1 attaches to a CGA320 CO2 tank valve to regulate the flow of compressed CO2 from zero to 15 cubic feet per hour. To maintain optimal CO2 levels in growing areas, connect the BCR-1 to a cycle timer or CO2 controller. Reliable 120-volt solenoid valve operation with a pressure gauge and flowmeter allows precise setting and adjustment. Includes two O-ring washers and 15 feet of 3/16-inch-ID tubing. Working pressure is 43.5 PSI; maximum input pressure is 4,000 PSI. One-year warranty.